Dichotomous keys split choices into two/three/scientific parts.

Mutations in the genetic code can occur when

Which of the following is true of vertebrates with four-chambered hearts? There is a partial mixing of oxygen-rich and oxygen-poor blood. There is no mixing of oxygen-rich and oxygen-poor blood.

Which of the following must be true to consider something to be alive?. a) it must be able to move. b) it must be able to respond to light. c) it must be able to convert energy from one to another

Which of the following is order of place apes, monkeys, and close relatives? * ntal mammals that includes humans, Mark only one oval. Hominin Hominoid O O Primate Arthropoid

A computer simulation is created to measure the impact of carpooling, creating a bus service and building a light rail system on the average commuting time for people in a small city.

If you were testing how well different laundry soaps cleaned your clothes, the control group would be:

The nurse is describing how to perform a testicular self-examination to a patient. Which of these statements is most appropriate? A. A good time to examine your testicles is just before you take a shower. B.

In which ways are RNA and DNA different? a. RNA has ribose sugar, DNA has deoxyribose sugar b. RNA has uracil, DNA has thymine c. RNA is single-stranded, DNA is a double-helix d. all of the above

Why do you have to spit out your gum before the extraction of DNA?

Humans have chromosome pairs.